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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0057b23729042eb4f1cf6080d055b7abb2809005e293593eaf01c5884cdb27b' 
  AND token = 'RIgYSyzbWEKlYpEaYUkRiS3OKPyjj0su8QlUy+W0Moc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}